Marine Equipment Pressure-resistant Cylinder Made Of Gr.5 Titanium Alloy

Marine Equipment Pressure-resistant Cylinder Made Of Gr.5 Titanium Alloy corresponding to the domestic grade TC4, with a nominal composition of Ti-6Al-4V, features high strength, lightweight properties, good sound transmission, non-magnetic behavior, and corrosion resistance. It is an important raw material for manufacturing pressure-resistant hulls for deep-sea equipment. The deep-sea environment is unique and extreme, with harsh conditions such as high pressure, high salinity, high temperature, and low oxygen, which impose very stringent requirements on material performance. Gr.5 titanium alloy pressure-resistant hulls not only need to withstand the superimposed external high seawater pressure and structural stress of the equipment and maintain stable operation under severe loading conditions, but also must possess excellent corrosion resistance, watertightness, lightweight characteristics, and anti-biofouling properties to ensure stable performance over long-term use. The pressure hull is a crucial structure in marine equipment; if it suffers structural damage leading to waterproof chamber leaks, it can cause battery short circuits, instrument failures, or even control system collapse, potentially resulting in titanium alloy hull cracking. Among common titanium alloy hull designs, cylindrical pressure hulls with circumferential ribs are the most widely used due to their ease of machining and the convenience they provide for internal equipment layout.

1. Dimensional Tolerance
Figure 1 shows a raw ring material for machining Marine Equipment Pressure-resistant Cylinder Made Of Gr.5 Titanium Alloy with room temperature tensile and microstructure parameters meeting AMS4928 standards. Figure 2 shows the Gr.5 titanium alloy pressure-resistant hull and end caps, with the hull having an outer diameter of 500 mm, an inner diameter of 450 mm, and a length of 1000 mm. The hull cavity includes a 30 mm wide circumferential rib, which effectively supports and strengthens the internal structure. The hull end ports have threaded holes for connection with bolts and end caps. The perpendicularity tolerance at both ends is required to be 0.1 mm, roundness tolerance also 0.1 mm, with all other tolerances meeting ISO2768 standard requirements.

2.2 Roughness
After machining the Gr.5 titanium alloy pressure-resistant cylinder, the surface roughness must be tested using a roughness meter. The surface roughness of the outer surface is required to be less than Ra 0.8μm, and the roughness of the end face sealing surface is required to be less than Ra 0.4μm.

The most common design structure for Marine Equipment Pressure-resistant Cylinder Made Of Gr.5 Titanium Alloy is usually a cylindrical body with ring ribs. Its advantages are easy machining and convenient installation of onboard equipment. The cylinder ends have threaded holes, connected with bolts and end caps, with the sealing surface positions requiring extremely high roughness standards. In the deep-sea field, there are devices such as UUVs, AUVs, ROVs, buoys, and sonar systems, with operational depths reaching up to 6000 meters, making titanium alloy one of the most widely used materials in marine equipment.

To ensure the sealing performance of the pressure-resistant cylinder in deep-sea environments, the surface roughness of the Marine Equipment Pressure-resistant Cylinder Made Of Gr.5 Titanium Alloy is highly critical. Additionally, dimensional tolerances are measured using coordinate measuring equipment, with inspection data provided. The appearance is smooth, without burrs, tool marks, or excess material, and the products are packaged and transported in specialized wooden boxes.

The company has focused on the forging and precision machining of titanium, titanium alloys, aluminum alloys, and other non-ferrous metal materials for 20 years. It is recognized as a high-tech enterprise and a specialized and innovative SME, equipped with 260 sets of production equipment, including HELLER five-axis milling and turning composite machining centers, CNC gantry milling machining centers, and coordinate measuring machines. It possesses the full-process deep machining capability for titanium and titanium alloy raw materials to precision components.

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